JP2001028161A - Spindle motor mounting device and mounting method - Google Patents

Abstract

(57) [Problem] To improve the positional accuracy of a spindle motor mounted on a base. A spindle motor for rotating a magneto-optical disk and a base chassis to which the spindle motor is attached are provided. Base chassis 1
1 is provided with a fixed shaft 48. Spindle motor 3
6 is provided with a fixing ring 49 having an insertion hole 55 through which the fixing shaft 48 is inserted. A gap a is provided between the outer periphery of the fixed shaft 48 and the inner periphery of the insertion hole 55 of the fixed ring 49 so that the fixed shaft 48 can be adjusted in the insertion hole 55. By filling 59, the spindle motor 36 is fixed on the base chassis 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor mounting device and a spindle motor mounting method for mounting a spindle motor for rotating a disk-shaped recording medium on a base.

[0002]

2. Description of the Related Art An optical disk device for recording and / or reproducing information on an optical disk such as an optical disk or a magneto-optical disk is known.

A conventional optical disk device for reproducing information from an optical disk includes an optical pickup unit for reproducing information from the optical disk, a disk rotation driving mechanism for driving the optical disk to rotate, and the optical pickup unit and the disk rotation driving mechanism. And a base chassis.

The optical pickup unit includes an optical system having a light source for emitting laser light, an objective lens for condensing the laser light on a recording area of the optical disk, and a light receiving unit for receiving light reflected from the optical disk. . The optical pickup unit includes a biaxial actuator for driving and displacing the objective lens in two axial directions parallel to and orthogonal to the optical axis of the objective lens.

The disk rotation drive mechanism has a disk table on which an optical disk is placed, and a spindle motor for rotating the disk table. The disk table is formed in a disk shape having a mounting surface on which an optical disk is mounted.

As a spindle motor, a CLV (Constant Linear Velocity) motor having a constant linear velocity is used. The spindle motor has a disk table attached to the tip of the rotating shaft.

[0007] The base chassis is substantially at the center on the main surface,
A disk rotation drive mechanism is provided. Then, the spindle motor of the disk rotation drive mechanism is fixedly mounted on the base chassis.

[0008] In the optical disk device configured as described above, the disk rotation drive mechanism is configured such that an optical disk is mounted on a turntable and is rotated by a spindle motor. Then, the optical disk device moves the optical pickup unit to a desired recording track in a recording area of the optical disk, and reproduces information from the recording area of the optical disk by the optical pickup unit.

[0009]

Incidentally, the conventional optical disk apparatus has a problem that a relative inclination (hereinafter, referred to as a disk skew) occurs between the recording surface of the optical disk and the optical axis of the optical pickup unit. is there. The conventional optical disk device has a disadvantage in that when reproducing information from an optical disk, optical skew occurs and optical aberrations are generated, so that a reproduced signal of the optical disk is greatly deteriorated.

The disk skew greatly depends on the mechanical accuracy of the optical pickup, the base chassis, and the spindle motor. Therefore, the inclination of the optical axis of the optical pickup unit, the inclination of the base chassis, and the inclination of the spindle motor require high precision, and it is difficult to improve the productivity. Had become.

In the optical disk drive, if the optical pickup, the base chassis, and the spindle motor are inclined in directions opposite to each other, the reproduced signal such as jitter due to the optical pickup is deteriorated, and the production line is deteriorated. This has the adverse effect of lowering the yield and lowering the production quality.

That is, in an optical disk device, it is required to mount a spindle motor on a base chassis with high accuracy in order to reduce disk skew.

Accordingly, an object of the present invention is to provide a spindle motor mounting apparatus and a spindle motor mounting method capable of improving the positional accuracy of a spindle motor mounted on a base.

[0014]

In order to achieve the above-mentioned object, a spindle motor mounting apparatus according to the present invention comprises:
A spindle motor for rotating a disk-shaped recording medium and a base to which the spindle motor is attached are provided. One of the spindle motor and the base is provided with a fixed shaft, and the other is provided with a cylindrical fixing member having an insertion hole through which the fixed shaft is inserted. And, between the outer periphery of the fixed shaft and the inner periphery of the insertion hole of the fixed member,
A gap that allows the fixed shaft to be adjusted is provided in the insertion hole, and the fixing agent is filled in the gap, whereby the spindle motor is fixed on the base.

In the spindle motor mounting apparatus constructed as described above, the fixed shaft is inserted through the insertion hole of the fixed member, and the fixed shaft is inserted in the axial direction within the gap between the outer periphery of the fixed shaft and the inner periphery of the fixed member. The position of the spindle motor with respect to the base is adjusted by adjusting in a direction perpendicular to the axial direction and in a direction inclined with respect to the axial direction. With the spindle motor mounting device, with the spindle motor positioned at a desired position with respect to the base, by filling and solidifying the adhesive in the gap between the outer periphery of the fixed shaft and the inner periphery of the fixed member, The spindle motor is positioned and fixed at a predetermined position on the base.

Further, according to the method of mounting a spindle motor according to the present invention, there is provided a fixed motor having one of a fixed shaft of a spindle motor and a base to which the spindle motor is mounted, and having an insertion hole through which the fixed shaft is inserted. In this method, a member is provided and a spindle motor is mounted on a base. The mounting method of this spindle motor is to insert the fixed shaft through the insertion hole of the fixed member,
After adjusting the axial inclination of the rotating shaft of the spindle motor by adjusting the position of the fixed shaft in the insertion hole, the fixing agent is inserted into the gap between the inner periphery of the insertion hole of the fixed member and the outer periphery of the fixed shaft. And fix.

In the above-described method of mounting the spindle motor, the fixed shaft is inserted through the insertion hole of the fixed member, and the fixed shaft is orthogonal to the axial direction and the axial direction within the gap between the outer periphery of the fixed shaft and the inner periphery of the fixed member. The relative position of the spindle motor with respect to the base is adjusted by adjusting the spindle motor in a direction in which the spindle motor is inclined with respect to the axis direction. After adjusting the position of the spindle motor with respect to the base, the spindle motor is positioned at a predetermined position on the base by filling and solidifying a fixing agent in a gap between the outer circumference of the fixed shaft and the inner circumference of the fixing member. And fix it.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, this optical disc device 1 includes:
Disk cartridge 3 containing magneto-optical disk 4
Is removably mounted.

As shown in FIG. 1, an optical disk drive 1
A cartridge holder 10 that holds a disk cartridge 3 and moves to a cartridge insertion / removal position where insertion / removal of the disk cartridge 3 can be inserted / removed into / from a device and a cartridge mounting position where information can be recorded on / from the disk cartridge 3 And a base chassis 11 that movably supports the cartridge holder 10.

As shown in FIG. 1, the optical disk device 1 includes an optical pickup unit 1 for reproducing information from a magneto-optical disk 4 of a disk cartridge 3.
5 and a magnetic head unit 16 for recording information on the magneto-optical disk 4 in the disk cartridge 3.

As shown in FIG. 1, the optical disk device 1 has a disk rotation drive mechanism 17 for rotating the magneto-optical disk 4 of the disk cartridge 3 mounted at a predetermined cartridge mounting position.

Although not shown, the cartridge holder 10 is formed at a position facing the main surface of the disk cartridge 3 and at a position facing both side surfaces of the disk cartridge 3 in the insertion / removal direction. And a holding piece for holding 3. As shown in FIG. 1, the cartridge holder 10 is provided with a rotation support shaft 19 that is rotatably supported by the base chassis 11. In the cartridge holder 10, a recording opening for allowing the magnetic head 16 to face the magneto-optical disk 4 in the disk cartridge 3 to be held is formed in the top plate.

As shown in FIG. 1, the base chassis 11 is integrally formed with a support piece 20 for rotatably supporting the cartridge holder 10.
At 0, the cartridge holder 3 is rotatably supported via a rotation support shaft of the cartridge holder 10.

An optical pickup unit 15 is movably disposed on the base chassis 11, and a disk rotation drive mechanism 17 is disposed substantially at the center. An opening 22 for reproduction for allowing the optical pickup unit 15 to face the cartridge mounting position is provided on the main surface of the base chassis 11.
Are formed.

As shown in FIGS. 1 and 2, the optical pickup unit 15 includes a light source (not shown) that emits a laser beam, an objective lens 23 that focuses the laser beam on a recording area of the magneto-optical disk 4, and a magneto-optical device. An optical system having a light receiving unit (not shown) for receiving light reflected from the disk 4 is provided. The optical pickup unit 15 is provided for driving and displacing the objective lens 23 in two axial directions, a focusing direction parallel to the optical axis of the objective lens 23 of the optical system and a tracking direction orthogonal to the optical axis of the objective lens 23. Not equipped with a biaxial actuator. Then, the optical pickup unit 1
5 is a head support mechanism 25 as shown in FIGS.
Movably provided on the base chassis 11.

As shown in FIG. 2, the magnetic head section 16
It is arranged at a position facing the optical pickup unit 15. The optical pickup unit 15 and the magnetic head unit 16 are respectively attached to the connecting member 27 and can be moved integrally.

As shown in FIG. 2, the magnetic head 16
Magnetic head 3 for recording information on magneto-optical disk 4
0 and a support arm 31 that supports the magnetic head 30 at the tip. The base end of the support arm 31 is rotatably supported by a connection member 27 that connects the optical pickup unit 15 and the magnetic head unit 16 via a rotation shaft (not shown).

The disk rotation drive mechanism 17 is shown in FIGS.
As shown in FIG. 3, a disk table 35 on which the magneto-optical disk 4 is mounted, and a spindle motor 36 for rotating the disk table 35 are provided.

The disk table 35 is formed in a disk shape having a mounting surface 38 on which the vicinity of the center hole of the magneto-optical disk 4 is mounted. The disk table 35 has an engaging portion 39 at the center of the mounting surface 38 for engaging with the center hole of the magneto-optical disk 4. In this engagement portion 39,
Although not shown, a magnet for attracting a center hub provided in the center hole of the magneto-optical disk 4 is provided.

As the spindle motor 36, a CLV (Constant Linear Velocity) motor having a constant linear velocity is used, and has a rotating shaft 40 to which a disk table 35 is fixed at the end. Spindle motor 36
A support plate 43 for supporting the spindle motor 36 is fixedly provided on the outer peripheral portion of the motor. On the support plate 43, a circuit board 44 having a connection line for supplying electric power to the coil inside the spindle motor 36 is provided.

As shown in FIG. 4, the disk rotation drive mechanism 17 has a motor mounting mechanism 46 for positioning and mounting the spindle motor 36 at a predetermined position with respect to the base chassis 11.

The motor mounting mechanism 46 which is a main part of the present invention.
As shown in FIGS. 2 and 4, three fixed shafts 48, 48, 48 provided on the base chassis 11 and the fixed shafts 48, 48, 48 provided on the spindle motor 36 are respectively inserted therethrough. The fixed rings 49, 49,
49.

As shown in FIGS. 2 and 4, the base chassis 11 has a substantially U-shaped cutout 51 for protruding the disk table 35 of the disk rotation drive mechanism 17 toward the cartridge mounting position. Is formed. On the bottom surface of the base chassis 11, as shown in FIG. 4, there is formed a mounting concave portion 53 on which the support plate 43 of the spindle motor 36 is mounted in an overlapping manner. The mounting recess 53 is formed in a shape slightly larger than the outer shape of the support plate 43.

As shown in FIG. 4, the fixed shafts 48, 48, and 48 are respectively protruded from the bottom surface of the base chassis 11 at predetermined positions in the mounting recesses 53 of the base chassis 11, and are erected. I have.

As shown in FIG. 4, the fixing rings 49, 49, 49 are formed in an annular shape by a metal material, for example, and have an insertion hole 55 through which the fixing shaft 48 is inserted, as shown in FIG. are doing. The insertion hole 55 of the fixing ring 49 is
As shown in FIG. 5, a predetermined gap a that allows the fixed shaft 48 to be adjusted is provided on one side in the radial direction of the insertion hole 55 between the outer peripheral portion and the inner peripheral portion of the inserted fixed shaft 48. Is formed.

The fixing ring 49 is formed to have a thickness such that the tip of the fixed shaft 48 inserted through the insertion hole 55 slightly projects. 4 and 5.
As shown in FIG. 7, the outer peripheral portion is engaged and fixed in a mounting hole 57 formed at a predetermined position of the support plate 43 of the spindle motor 36.

The fixing ring 49 has the fixing shaft 4
8 and the outer periphery of the fixed shaft 48 and the insertion hole 55
As shown in FIG. 5, the base chassis 1
The fixed shaft 48 has a predetermined gap a sufficient to adjust the position of the spindle motor 36 and the inclination of the rotary shaft 40 with respect to the fixed shaft 48.
Is formed over the entire circumference of

As shown in FIG. 5, the spindle motor 36 is provided with a fixing agent 5 such as solder in a gap a between the outer periphery of the fixed shaft 48 and the inner periphery of the insertion hole 55 of the fixed ring 49.
By filling and solidifying 9, it is joined and mounted on the base chassis 11.

As the fixing means, a fixing agent such as an ultraviolet-curing adhesive or a thermosetting adhesive may be used.
For example, they may be joined by laser welding.

In the spindle motor 36 mounted on the base chassis 11 as described above, the disk table 35 protrudes from the main surface of the base chassis 11 toward the cartridge mounting position.

The motor mounting mechanism 46 described above is
The fixed shaft 48 is configured to be erected on the base chassis 11.
Above, a fixing protrusion inserted into the fixing ring 49 may be integrally formed. Similarly, the motor mounting mechanism 46 described above has a configuration in which the fixing ring 49 is provided on the support plate 43 of the spindle motor 36,
A fixing hole having a cylindrical projection through which the fixing shaft 48 is inserted into the support plate 43 may be integrally formed by drawing.

In the motor mounting mechanism 46 described above, the fixing shaft 48 is inserted into the fixing ring 49, and the fixing shaft 48 is fixed at three places. Needless to say, a configuration in which a fixing portion is provided may be adopted.

With respect to the method of mounting the spindle motor 36 by the motor mounting mechanism 46 described above, the position of the spindle motor 36 with respect to the base chassis 11 and the inclination of the rotating shaft 40 are adjusted, and the spindle motor 36 is positioned at a predetermined position on the base chassis 11. Will be described with reference to the drawings.

In general, in an optical disk device, a signal reproduced by the optical pickup unit is best when the optical axis of the optical pickup unit is perpendicular to the recording surface of the optical disk rotated and driven by the spindle motor.

[0045] First, by confirming the reproduced signal by the optical pickup unit 15, so that the reproduction signal obtained is optimized, tangential direction shown in FIG. 4 in the arrow t ₁ direction and t ₂ directions, and in FIG. 4 adjusting each tilt of the rotation axis 40 of the spindle motor 36 against the radial direction indicated by the arrow r ₁ direction and r ₂ directions.

Next, the Lissajous waveform of the tracking error signal displayed on, for example, an oscilloscope is checked. For example, when the three-beam method is used as the tracking error detection method, the tracking error signal is obtained by a photodetector that receives ± 1st order light. Lissajous waveform is the so becomes the best, by Chodo the spindle motor 36 with respect to FIG. 4 in the arrow x ₁ direction and the x ₂ direction, to position the spindle motor 36.

Further, the address signal of the magneto-optical disk 4 by the optical pickup unit 15 is adjusted so as to be the best in FIG.
By Chodo the spindle motor 36 relative to the middle arrow y ₁ direction and the y ₂ direction, to position the spindle motor.

Finally, by confirming the drive control signal of the two-axis actuator of the optical pickup unit 15, an arrow h in FIG.
By Chodo the spindle motor 36 relative to the _first direction and h ₂ directions, to position the position in the height direction of the spindle motor 36.

Then, as described above, the base chassis 1
After adjusting the position of the spindle motor 36 with respect to the upper surface 1 in each direction, the spindle motor 36 positioned at a predetermined position on the base chassis 11 is moved between the outer periphery of the fixed shaft 48 and the inner periphery of the insertion hole 55 of the fixed ring 49. The gap a is fixedly attached to a predetermined position on the base chassis 11 by filling and solidifying a predetermined amount of a fixing agent 59 such as solder, for example.

As a method of adjusting the position of the spindle motor 36 with respect to the base chassis 11, in addition to checking the reproduced signal from the optical pickup unit 15 as described above, a position detection sensor or the like for detecting the position of the spindle motor 36 is used. By doing so, positioning may be performed by mechanically detecting the position of the spindle motor 36.

The operation of recording and reproducing information on and from the magneto-optical disk 4 in the optical disk device 1 configured as described above will be described.

First, in the optical disk device 1, the disk cartridge 3 is inserted into the cartridge holder 10 and is mounted at a predetermined cartridge mounting position, so that the magneto-optical disk 4 in the disk cartridge 3 is driven by a disk rotation driving mechanism. 17 is placed on the disk table 35.

In the optical disk drive 1, the disk rotation drive mechanism 17 rotates the magneto-optical disk 4 placed on the disk table 35, and rotates the optical disk 4 with respect to a desired recording track in the radial direction of the magneto-optical disk 4. Pickup unit 15
Then, the magnetic head unit 16 is moved. Then, the optical disk device 1 reproduces information from the magneto-optical disk 4 by the optical pickup unit 15, and
To record information on the magneto-optical disk 4.

As described above, the optical disk device 1
By providing the motor mounting mechanism 46 having the fixed shaft 48 and the fixed ring 49, it is possible to adjust the position of the spindle motor 36 with respect to the base chassis 11 and the inclination of the rotating shaft 40, and mount the spindle motor 36 with high accuracy.

Therefore, according to the optical disk device 1, the optical axis of the optical pickup unit 15 is perpendicular to the recording surface of the magneto-optical disk 4 rotated by the spindle motor 36, so that the disk skew is greatly reduced. Can be reduced. For this reason, the optical disc device 1
Thus, the quality of the reproduction signal obtained from the magneto-optical disk 4 can be improved.

The motor mounting mechanism 17 provided in the optical disk device 1 has a fixing ring 49 provided on the spindle motor 36 side and a base chassis 1
Although the fixed shaft 48 is provided on one side, it is needless to say that the fixed shaft 48 may be provided on the spindle motor 36 side and the fixed ring 49 may be provided on the base chassis 11 side.

Further, the optical disk device 1 according to the present invention
Was applied to a magneto-optical disk as an information recording medium. For example, a CD (Compact Disc), a CD-R (Recordabl
e), may be applied to other optical discs such as DVD (Digital Varsatile Disc), and disk-shaped recording media such as magnetic discs. In particular, due to high recording density, the allowable range of disc skew is relatively high. It is suitably applied to a narrow optical disk such as a DVD.

[0058]

As described above, according to the spindle motor mounting apparatus according to the present invention, the fixed shaft is inserted through the insertion hole of the fixed member to perform adjustment, and the fixing agent is filled and solidified in the adjusted state. The spindle motor can be mounted on the base with high accuracy.

According to the spindle motor mounting method of the present invention, the fixed shaft is inserted through the insertion hole of the fixed member to perform adjustment, and the fixed state is filled with a fixing agent to solidify the spindle motor. Can be mounted on top with high precision.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an optical disk device according to the present invention.

FIG. 2 is a plan view showing a main part of the optical disk device.

FIG. 3 is a side view showing a main part of the optical disk device.

FIG. 4 is a perspective view showing a motor mounting mechanism provided in the optical disk device.

FIG. 5 is a longitudinal sectional view for explaining the motor mounting mechanism.

[Explanation of symbols]

Reference Signs List 1 optical disk device, 4 magneto-optical disk, 11 base chassis, 15 optical pickup section, 17 disk rotation drive mechanism, 36 spindle motor, 46 motor mounting mechanism, 48 fixed shaft, 49 fixing ring, 55
Insertion hole, 59 adhesive, a gap

Claims (6)

[Claims] 1. A spindle motor for rotating a disk-shaped recording medium; and a base to which the spindle motor is attached. One of the spindle motor and the base has a fixed shaft, and the other has a fixed shaft. A cylindrical fixing member having an insertion hole through which the fixed shaft is inserted is provided. Between the outer periphery of the fixed shaft and the inner periphery of the insertion hole of the fixed member, the fixed shaft can be adjusted in the insertion hole. Wherein the gap is filled with an adhesive and the spindle motor is fixed on the base. 2. The spindle motor mounting device according to claim 1, wherein the fixing agent is solder. 3. The spindle motor according to claim 1, wherein the spindle motor and the base are provided with at least three fixing points where the fixing shaft and the fixing member are fixed to each other. Mounting equipment. 4. A fixed member having one of a spindle motor and a base to which the spindle motor is attached is provided, and a fixing member having an insertion hole through which the fixed shaft is inserted is provided on the other, and the base is provided on the base. When mounting the spindle motor, the fixed shaft is inserted into the insertion hole of the fixed member, and the position of the fixed shaft is adjusted in the insertion hole to adjust the inclination of the rotation axis of the spindle motor in the axial direction. A method of mounting a spindle motor, comprising: filling a gap between an inner circumference of an insertion hole of the fixing member and an outer circumference of the fixed shaft and then fixing the gap. 5. The method according to claim 4, wherein the fixing agent is solder. 6. The method of mounting the spindle motor,
After adjusting the beam light emitted to the optical disk rotated by the spindle motor to be emitted perpendicular to the recording surface of the optical disk, the spindle motor is fixed on the base. 5. The method for mounting a spindle motor according to claim 4, wherein: